Which of the following contributed most to increase settlement of the Great Plains ?

A series of federal land grants

Explanation:

Congress passed a law allowing peope to claim public land and convert it to private property through homesteading. The Great Plains is the broad expanse of flat land that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the US and Canada.

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts

do you have a list of sources to choose from?